I was really impressed. The place is HUGE - about 6x or more the size of the Hop Lops. There are many rooms and one large open area, a large service food area, and quite a bit for the kids to do. The smaller kids areas are sectioned off upstairs and quite nice and private from the rowdier big kid stuff. The big kid areas include large trampolines, the electric/gas cars, various bouncy tents and slides, etc, and electronic games.
The pricing structure is a bit different. It's 16e for a full day - rather than 9e for two hours like at most hop lops. The areas are very well spread out and easy to sit at - it makes for a nice day.
So I highly recommend it above all the other indoor play parks in Espoo and Vantaa. This one is really clean, spread out, has more services, and more value for the money, in my opinion.
And the birthday party was a hit for the kids
Here's the website with more specific info:
http://www.huimala.fi/